I would definitely get the latest version. I helped Arthmoor with some testing and we discovered that there's a major problem with one of the quests. Mind you, if you've cleared out the sanctuaries already, some of the bug fixes won't help as much. But I'd still get the latest version and see if that helps.
Lastly, I haven't used moveto in a bit. Try this if you still need to find him after upgrading:
prid 3558D
moveto player
Prid sets the current reference. After doing prid, you should see "Scar-Tail" printed at the top of your screen.
Ok, I'll definitely update and then give that line a whirl.
I have just tried switching the previous line around though, to stranger consequences. Player.moveto 3558D worked, and ported me to the quest marker at Bogwater camp. Of course, Scar-Tail still wasn't there. I toggled collision to check inside the rock I was standing next to, and below ground, as well as looking in the sky for a brief moment, but he's still nowhere to be seen! Hopefully an update fixes the problem
EDIT: Updated to the latest version, Scar-Tail is still invisible when I port to him, and although using prid allows me to port him to my character he's still invisible then too. And it's not a spell effect invisibility. If it weren't for the green quest marker I'd never know he even existed. So, :ahhh:
This is well and truly bizarre. I've looked through my list of completed quests and noticed that The Renegade Shadowscale, the quest he appears in, isn't listed. Is it possible to miss that quest? I have close to 150 hours logged on this character so it's hard to remember what I have and haven't done. But if I haven't completed the quest, then that could explain why getdeadcount returns a 0, and perhaps the character is only spawned when the quest begins. So the quest marker just points to the character's spawn point, rather than Scar-Tail himself? I might have to return to Arquen and settle for her recommendation, if that's still an option at this point. To be honest, Scar-Tail seems so unreliable at this point that giving him a leadership position seems like a bad managerial decision